when I went for an oil change I told the guy I needed my rear blinker fluid check and kept a straight face. he was half way to back of truck before he realized what I said LOL
I work in an auto parts store and we get these guys all the time thinking they are being original. A good one is when they ask for a muffler bearing and I pull out a rubber exhaust hanger. Hey! It bears the weight of the muffler and there was a Nissan years ago that actually called it a muffler bearing in thier manuals. The best though is to call another shop and tell them that your mechanic says you need a new fallopian tube for your '93 Volvo S70. New guys go nuts trying to look that up!